Donjon Master

+2: Draw a card, you gain advantage until the end of your next turn. (If you would roll a d20, instead roll two d20 and ignore one.)
-3: Roll a d20, then create a X/X shapeshifter creature token with changeling that is all color, where X is equal to the result.
-10: You get an emblem with, whenever you roll a d20 you can choose the result instead of rolling. (This card can be your commander)